Implement for sharpening disk knives



N M a 1. R. H. DODGE -& H. s. CLINTON.

IMPLEMENT FOR SHARPENING DISK KNIVES .No. 531,364. Patented Dec. 25, 1894.

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\ UN TED STATEs PATENT OFFICE.

RODNEY H. DODGE AND HARMON S. CLINTON, OF ANGONA, ILLINOIS.

lMPLEMENT FOR SHARPENING DISK KNIVES.

SPECIFICATION forming part of Letters PatentNo. 531,364, dated December 25, 1894.

Application filed August 27, 1894- $erial No. 621,39d. (No model.)

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has relation to an improvement in implements forsharpening circular knives or cutting disks, and it has for its prime object to provide a device at a minimum expense which will serve very efiectively in sharpening knives or disks while mounted upon rotatable shafts, and will require but little or no experience on the part of the operator; the parts being so combined and arranged that the implement may be adjusted to various heights, and will engage the knife so as to aid in holding itself in position while the knives are being turned against the cutter, without interfering with its being moved by the operator in order to form the desired bevel on the knife.

The invention will be fully understood from the following description and claims when taken in connection with'the annexed drawings, in which-.

Figure 1, is a perspective view of our improved device showing the same ready for use. Fig. 2, is a sectional view taken in the plane indicated by the dotted line 00, w, on Fig. 1, showing the same with a knife in position to be sharpened and a part of the shaft upon which the knife is mounted as well as a part of the crank arm for turning the shaft. Fig. 3, is a perspective view of the crank arm removed. 4

Referring by letter to said drawings:-A, indicates a bar which may be composed of wood or other suitable material, having a handle turned on one end, and while the bar is here shown as of rectangular form in cross section, it may be of any suitable form or configuration. This bar is provided'at a suitable point in its length with a transverse aperture a, and in this aperture is placed a steel blade or cutter b, which may be secured in position tening device, and the cutting edge at, of this cutter projects sufficiently from one side of I headed at one end and takes through the bar A, near its lower end, with its projecting and headed end passing into the slot of the leg. A thumb screw g, is employed on the threaded end of this rod or bolt for securing the same, and a guide pin h, may be provided in addition to the bolt to take through the slot of the leg and aid in guiding'and retaining said leg imposition.

0, indicates a flat spring or springs composed of flat metal and preferably steel. This spring is curved as shown, and is secured at its upper end to one side of the bar A, by means of a bolt 2', and nut or other suitable fastening devices. The lower end of this spring-extends to a point opposite the cutter or approximately so, and its tension is regulated by means of a threaded bolt 10, which is fixed in the bar A, and'passes through the spring at an intermediate'point in its length, and the thumb screw Z, arranged on said bolt to bear against the outer side of the spring. This spring is designed to engage the outer side of the disk or circular knife to be sharpened so as to aid in holding the implement,

against the knife or disk.'

D, indicates a part'of a shaft, and E, indicates a part of a circular knife or disk designed to be secured to said shaft. The shaft may contain any number of disks or circular knives and a detachable crank arm as F, may be employed for turning the shaft and consequently the knives or disks. This crank arm may be of any suitable construction; the one here shown having an eye to receive the'shaft, and four bolts or screws for detachably connecting said arm and shaft.

In using ourimproved implement, the leg 13, is first adjusted andadjustably fixed so that when the lower end of the implement rests by means of a wedge c, or other suitable fas- I upon the ground or other base,the cutter will engage the disk knife at the proper point. The implement is then placed in engagement with the knife with the cutter b, on one side and the spring 0, on the opposite side, and the thumb screw Z, is adjusted, if necessary to regulate the tension of the spring. The operator grasps the implement at its upper end and at an intermediate point of its length, and by reason of the spring G,being employed instead of a rigid clamp, the operator is enabled, as the knife is rotated, to adjust the implement so as to form the desired bevel on the knife, which is a desideratum.

Having described our invention, what We claim is- 1. The herein described disk knife sharpener comprising the bar or frame A, the leg or support B, adjustably connected to the bar or frame A, a sharpening blade or implement carried by the bar or frame A, and adapted to engage one side of a disk knife and the spring connected to the bar A, and adapted to engage the opposite side of the disk knife, substantially as and for the purpose set forth. 2 5

2. The herein described disk knife sharpener comprising the bar or frame A, the leg or support B, having a longitudinal slot, a bolt extending through the slot of the leg B, and the bar A, a thumb screw mounted on said 30 bolt, a sharpening blade or implement carried by the bar or frame A, and adapted to engage one side of the disk knife, the spring 0, connected at one end to the bar A, and adapted to engage the opposite side of a disk-knife, a 3 5 threaded bolt taking through the spring 0, and bar A. and a thumb screw mounted on said bolt, substantially as and for the purpose set forth.

In testimony whereof we aifix our signatures 40 in presence of two witnesses.

RODNEY II. DODGE. I'IARMON S. CLINTON. Witnesses:

E. E. AMES, JAMES HOLCOMB. 

